Furnace stokeb mechanism



Jan. l2, 1923.

R.v s. RILEY. FURNACE STOKER MECHANISIVI.

2 SHEETS SHEET l.

s@ www.

all A2,

-Ri s. RILEY, FURNAGE STOKERA MECHANISM.

2 SHEETSfSHEET 2.

FILED M514l 119m rm if. il@ A o A. feature of' f improved devicesfor4 securing the overfeedr` Patented Jan. 2, 19h23.

UNITED STATES e 1,441,026 PATENT OFFICE.

ROBERT SANFORD RILEY, OF WORCESTER, MASSACHUSETTS, .VSSIGNOR T O SAFORD i RILEY STOKER,l C0., LTD., OF `YVORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

Application filed May` 14,

To @ZZ whom t may concern.'

Be `it known that I, ROBERT SANFonn v5 resulting in economy of manufacture and `in efficient operation, together with greatly ucreased strength. j

Another object of my invention is to provide' an improved water cooling device for n protecting thebridge wall Aof the Stoker, with special provision for convenient removal and replacement.

A third object of my invention is to provide` a yielding adjustable support for the "25 lower ends ofthe dumping plates adjacent the clinker grinder7 to relieve any excessive pressure which `may be caused by engagement of the clinker grinder with stone or other foreign substance.

ny invention also relates to grates in operative position. My invention f further relates-to arrangements and combina'tions of parts which will be hereinafter described and morev particularly pointed out l vin the appended claims. f

.fr preferred form -of my invention is shown in the drawings in which Fig. 1 is a sectional side elevation of a portion of a Stoker mechanism;

. Fig. l:

along the line 3-8 in Fig. 2;

tion of portions of the overfeed grates,

`Fig. 5 is a sectional elevation taken along4 Fig. 2 is a front elevation of parts of the, mechanism, taken along the line 2-2 in through whichvthe water from the spray FigfB is a detail sectional plan view taken Fig. 4 is an enlargedsectional side eleva-4 rUnNAon sToKnn MnoHANrsi/r.,

i919. serial No. 297.0459.

and downward adjacent a clinker grinder indicated generally by the numeral 13.

A.t their upper ends the plates 12 are pivotally connected to move forward and rearward with the overfeed grates 11 and at their lower ends they are supported for rocking movement on rolls 14 mounted on yrack bars 15 which may be adjusted longitudinally by a hand wheel 16 connected to the rack bars by means of a worm 17, a 'worm wheel 18, a shaft 19 extending from side to side of the stoker, and pinions 20 fixed to the shaft 19 and engaging the rack bars 15.

The worm 17 is keyed -or otherwise slidably secured to a worm shaft 21 rotatable in" a tired bearing 22, the worm engaging the lower surface of they bearing, and a collar 28 fixed onrthe shaft 21 engaging thel'upper surface thereof. A heavyv coilv spring' 241 isinounted on the lower end of the shaft 21y and is held in engagement with the worm 21 by an adjustable nut 25. 1

Under ordinary conditions the rack bar 15 stands in the adjusted position determined by the handl wheel 16 and worm 17."

Y ings 29 are secured in the recess 28 by bolts 30', and protecting plates 31 are secured to the castings 29 by suitable fastening devices such as bolts or rivets 82. The plates 31 are preferably .made in relatively short sec tions `corrugated and overlapping asshown 4inFig. 3., and are `provided with openings` 38 pipe,` 27 trickles Vdown over the protecting plates and may drip therefrom on the clinker grinder 13.V Thejcastings 29v are recessed ,in their upper v.rear portions so that (Fig. 2) rotatable in fixed bearings in the furnace side walls 3i'. Any suitable provision may be made for slowly rotating the clinker grinder, such as a ratchet wheel 38 fixed to the end of the shaft 34 and engaged by a feed' pawl 39 intermittently actuated by driving means not shown.

The shaft 34 is surrounded by a casing formed in section 40 (Fie: l) `clamped about the shaft 34 by bolts 4l. The sections 40 are of relatively short-length, being preferably equal to the width of a retort, and are assembled about the shaft v34 in such a way that the different sections extend beyond each other endwise, thus breakingv joints and materially stifening the structure. Special short sections are necessarily provided to till out the casing at the extreme ends thereof.

The actual grinding operation is performed by a plurality of grinding plugs 42 each having an enlarged head 43 at its innerend and extending outwardly througl'i retaining plates rlfherplates 44 preferably each extend `around one-quarter of the circumference of the clinker grinder, and are secured to each other and tothe casii'ig members 40 by' fastening devices 45 extending through openings insaid plates. The plates 44 are also preferably of retort length, and are secured in place with. their ends extending beyond each other as in the case of the casing sections 40.

This feature of breaking joints, both with the.y casing sections Vand with the retaining plates,is very important and permits the use of a much lighter shaft 34 than would be otherwise feasible, or theientire omission of the shaft.

Theplates 44 are so constructed thatthey will provide smooth cylindrical portionsf4b (Fig. 2) between-.the rowsof grinding plugs. Fixed supporting rolls47 and 48- (Fig. l) are provided below andy to the rear of the clinker grinder '1,3 ati-points intermediate thev end bearings of the shaft 34. The rolls 4? resist` the grinding pressure of the clinker grinder, and. the rolls 48 support the weight thereof atintermediate points. The rolls 47 and 4S are provided with fixed bearings on thel stoker framework.

In Fig. `4 I have shown improved devices for securing the overfeed grates l1 in position. These grates. are slipped into position from the, rear, and it is desirable that they should be readily removed as they require frequent replacement. Tf they are secured by bolts and nuts or other similar fastening devices, it isveryv difiicult to remove themas it is impossible to separate the fastening devices after they have been exposed to furnace conditions for any length of time. T have therefore provided the improved securing means shown herein.

Holes are provided in the intermediate and forward portions of each grate, and holes 5l extend downward from recesses 52 in the rear portion of each grate, the holes 50 and 5l of overlying grates being aligned when the parts are in operative position. The recesses 52 are provided with overhanging side walls 53 (Fig, 5) forming pockets around. the heads of the fastening devices These devices rods having enlarged shown in the drawing. s the grates are merely rough castings, it is desirable that the holes 5() and 5l be somewhat larger than the rods 55 to accommodate variations in the castings.

In assembling the parts it is merely necessary to drop the headed fastening members 55 through the holes 50 and 5l, the heads being received in the recesses 52. As soon as the stoker is placed in operation the recesses 52 immediately-fill up with slag or other refuse, which effectually prevents dislodgment of the fastening members, but which permitsvthem to be driven out when a grate is to be replaced. This form of fastening is extremely simple and economical, and is found very advantageous for my purposes.

Having thus described my invention and the details of construction thereof, it will be seen that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope thereof as set forth in the claims, and T do not wish to be otherwise limited to the details herein disclosed, but what I claim is l. In a stoker mechanism, a dumping plate, means to rock said plate, a support for the lower end of said plate, means to adjust said support forwardly and rearrwardly, and means acting through said support to permit yielding movement of said support and plate under excessive pressure.

2. ln a stoker mechanism, a dumping plate, means to rock said plate, a support for the lower end of said plate, adjusting means for said support including a worm and worm wheel, and a spring positioning said worm and ypermitting yielding axial movement thereof by said worm wheel to relieve excessive pressure on said plate.

Tn testimony whereof l have hereunto affixed my signature.

ROBERT SANFORD RILEY.

are preferably short 1 rounded heads, as 

